Communication method and communication device

Abstract

Provided are a communication method and a communication device, the method comprising: receiving a first synchronization signal, receiving a second synchronization signal, the width of a sending beam of the first synchronization signal being greater than the width of a sending beam of the second synchronization signal, the coverage range of the sending beam of the first synchronization signal comprises the coverage range of the sending beam of the plurality of second synchronization signals, the method sends the first synchronization signal by using a wider beam, so that the number of the first synchronization signals covering the terminal equipment is greater than the number of the second synchronization signals covering the terminal equipment within a period of time; and the time required by the terminal equipment in the initial access process is reduced.

Description

Technical Field

[0001] This application relates to the field of communications, and more particularly, to a communication method and a communication device. Background Art

[0002] Non-terrestrial networks (NTN) such as satellite communications have significant advantages such as global coverage, long-distance transmission, flexible networking, convenient deployment, and being unaffected by geographical conditions, and have been widely used in many fields such as maritime communications, positioning and navigation, disaster relief, scientific experiments, video broadcasting, and earth observation.

[0003] In the non-terrestrial network scenario, the network device and the terminal device need to perform beam alignment for subsequent data transmission. During the beam alignment process, the network device sends SSBs in different beam directions at a certain period, and the terminal device can adjust the direction of the receiving beam at a certain period to try to search for the SSB. When the number of transmission beam directions that the network device needs to scan is large, and the number of receiving beam directions that the phased array terminal can select is large, for example, up to hundreds of beam directions, the terminal device needs to complete beam scanning in two directions to achieve alignment with the network device. Therefore, how to reduce the time required by the terminal device during the initial access process is an urgent problem to be solved in this field. Summary of the Invention

[0004] Embodiments of this application provide a communication method and a communication device, which can reduce the time required by the terminal device during the initial access process.

[0005] In a first aspect, a communication method is provided. The method includes: receiving a first synchronization signal; receiving a second synchronization signal, where the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of a plurality of transmission beams of the second synchronization signal.

[0006] In embodiments of this application, the terminal device receives the first synchronization signal and the second synchronization signal sent by the network device, where the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of a plurality of transmission beams of the second synchronization signal, so that the number of first synchronization signals covering the terminal device within a period of time is greater than the number of second synchronization signals covering the terminal device. Furthermore, when the terminal device adjusts the direction of the receiving beam to try to receive the synchronization signal of the network device, it can search for the first synchronization signal more quickly compared to directly searching for the second synchronization signal. Thus, the receiving beam of the terminal device can be aligned with the network device faster, reducing the time required by the terminal device during the initial access process.

[0007] In the embodiments of the present application, the first synchronization signal is transmitted using a beam wider than the second synchronization signal, which can increase the coverage range of the transmission beam of the first synchronization signal on the ground, thereby reducing the time when the transmission beam cannot cover the location of the terminal device due to beam hopping, and preventing the terminal device from being unable to accurately point to the network device and not receiving the downlink signal sent by the network device due to too long beamless service time.

[0008] In combination with the first aspect, in some implementations of the first aspect, within the first time length, the number of first synchronization signals is greater than or equal to the number of second synchronization signals.

[0009] Specifically, the first synchronization signal may be located in the first signal set, and the first signal set may be continuously transmitted in a normalized manner; the second synchronization signal may be located in the second signal set, and the second signal set may be transmitted periodically. Since the first synchronization signal is transmitted using a wide beam and the second synchronization signal is transmitted using a narrow beam, within a period of time, the number of transmission beams of the first synchronization signal covering the terminal device is greater than the number of transmission beams of the second synchronization signal covering the terminal device.

[0010] In combination with the first aspect, in some implementations of the first aspect, receiving the second synchronization signal includes: receiving the second synchronization signal according to the received first synchronization signal.

[0011] In combination with the first aspect, in some implementations of the first aspect, receiving the second synchronization signal according to the received first synchronization signal includes: receiving the second synchronization signal according to the receiving beam direction of the first synchronization signal or the receiving beam codebook of the first synchronization signal.

[0012] In the embodiments of the present application, the terminal device receives the second synchronization signal according to the received first synchronization signal. The width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal, so that the number of first synchronization signals covering the terminal device within a period of time is greater than the number of second synchronization signals covering the terminal device. Therefore, compared with directly receiving the second synchronization signal, the terminal device can align with the network device faster, and then the terminal detects the second synchronization signal on the basis of aligning with the network device, reducing the time required for the terminal device in the initial access process.

[0013] In combination with the first aspect, in some implementations of the first aspect, the second synchronization signal has the same frequency domain center point as the first synchronization signal.

[0014] In the embodiments of the present application, the terminal device may detect the second synchronization signal in a frequency band with the same frequency domain center point after detecting the first synchronization signal, thus reducing the detection overhead of the terminal device.

[0015] In combination with the first aspect, in some implementations of the first aspect, the first synchronization signal includes a synchronization signal generated based on a physical cell identifier (PCI) or a partial content of the PCI, and the second synchronization signal includes a synchronization signal generated based on the PCI or a partial content of the PCI.

[0016] In combination with the first aspect, in some implementations of the first aspect, the first synchronization signal includes a primary synchronization signal (PSS), and the second synchronization signal includes a secondary synchronization signal (SSS).

[0017] It should be understood that the first synchronization signal may also be other forms of signals having the same function as the PSS, and the second synchronization signal may also be other forms of signals having the same functions as the SSS and the physical broadcast channel (PBCH). The embodiments of the present application do not limit this.

[0018] In combination with the first aspect, in some implementations of the first aspect, the sequence length of the PSS is greater than the sequence length of the SSS.

[0019] In the embodiments of the present application, since the beam width of the PSS is greater than the beam width of the SSS, and a wide beam will cause a loss of beam gain, when the network device sends the PSS, a sequence with a length greater than that of the SSS is used, which enables the terminal device to obtain a higher detection peak when detecting the PSS, increases the accuracy of the terminal device to confirm the reception of the PSS, thereby enhancing the performance of beam alignment between the terminal device and the network device and overcoming the loss of beam gain caused by the wide beam.

[0020] In combination with the first aspect, in some implementations of the first aspect, the first synchronization signal includes a first primary synchronization signal, and the second synchronization signal includes a synchronization signal block (SSB).

[0021] In combination with the first aspect, in some implementations of the first aspect, receiving the second synchronization signal includes: receiving a second primary synchronization signal in the SSB according to the received first primary synchronization signal, where the second primary synchronization signal corresponds to the first primary synchronization signal one by one, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal.

[0022] Specifically, the first primary synchronization signal and the second primary synchronization signal may be the same or different. The first primary synchronization signal and the second primary synchronization signal may be different forms of sequences generated using the same information, and the second primary synchronization signal may be determined by the first primary synchronization signal.

[0023] In the embodiments of the present application, since the second primary synchronization signal corresponds one-to-one with the first primary synchronization signal, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal, that is to say, the terminal device can determine the information of the second primary synchronization signal according to the information in the received first primary synchronization signal. Furthermore, the terminal device does not need to perform blind detection when receiving the second primary synchronization signal, saving the detection overhead of the terminal device.

[0024] In combination with the first aspect, in some implementation manners of the first aspect, the sequence length of the first primary synchronization signal is greater than the sequence length of the second primary synchronization signal.

[0025] In the embodiments of the present application, since the beam width of the first primary synchronization signal is greater than the beam width of the second primary synchronization signal, and wide beams will cause loss of beam gain, when the network device sends the first primary synchronization signal using a sequence with a length greater than that of the second primary synchronization signal, the terminal device can obtain a higher detection peak when detecting the first primary synchronization signal, increasing the accuracy of the terminal device to confirm the reception of the first primary synchronization signal, thereby enhancing the beam alignment performance between the terminal device and the network device and overcoming the loss of beam gain caused by wide beams.

[0026] In combination with the first aspect, in some implementation manners of the first aspect, receiving the second synchronization signal further includes: receiving the secondary synchronization signal SSS in the SSB according to the received second primary synchronization signal.

[0027] Specifically, the SSS must exist after the narrow-beam PSS. For example, the SSS can be located in the second symbol after the narrow-beam PSS. Therefore, when the terminal device detects the SSS, it only needs to perform a blind detection once at the determined time domain position to detect the SSS, saving the system overhead of the terminal device.

[0028] In the embodiments of the present application, when the terminal device detects the second primary synchronization signal, it has detected the second synchronization signal. Therefore, the SSS must exist after the second primary synchronization signal. Furthermore, the terminal device avoids the operation of repeatedly performing SSS blind detection to confirm whether a certain symbol is the SSS, reducing the blind detection overhead of the terminal device for detecting the SSS.

[0029] In combination with the first aspect, in some implementation manners of the first aspect, the method further includes: receiving the physical broadcast channel PBCH according to the second primary synchronization signal and the SSS.

[0030] Specifically, the terminal device calculates N according to the detected PSS and SSS and in ID , parses the PBCH in the second synchronization signal to obtain the PBCH payload and the MIB, further parses the SIB message, and the terminal device completes the initial access according to the MIB message and the SIB message.

[0031] In combination with the first aspect, in some implementations of the first aspect, the first synchronization signal is repeatedly transmitted on multiple frequency bands.

[0032] Furthermore, the first synchronization signals repeatedly transmitted by the network device on multiple frequency domains may be the same sequence or different sequences carrying the same information.

[0033] In the embodiments of the present application, since the beam width of the first synchronization signal is greater than the beam width of the second synchronization signal, and the wide beam will cause loss of beam gain, the network device repeatedly transmitting the first synchronization signal on multiple frequency bands enables the terminal device to receive a larger number of first synchronization signals within a period of time, increasing the chance for the terminal device to receive the first synchronization signals with power meeting the requirements, thereby reducing the time required for the terminal device in the initial access process.

[0034] In combination with the first aspect, in some implementations of the first aspect, receiving the second synchronization signal includes receiving the SSS in the second symbol after receiving the PSS.

[0035] In combination with the first aspect, in some implementations of the first aspect, receiving the second primary synchronization signal in the SSB includes: receiving the second primary synchronization signal in the first symbol after receiving the first synchronization signal.

[0036] In combination with the first aspect, in some implementations of the first aspect, receiving the secondary synchronization signal SSS in the SSB includes receiving the SSS in the second symbol after receiving the second primary synchronization signal.

[0037] In combination with the first aspect, in some implementations of the first aspect, the first synchronization signal is repeatedly transmitted in the time domain.

[0038] The second aspect provides a communication method, including: transmitting a first synchronization signal; transmitting a second synchronization signal, where the beam width of the transmission beam of the first synchronization signal is greater than the beam width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal.

[0039] In combination with the second aspect, in some implementations of the second aspect, within the first time length, the number of the first synchronization signals is greater than or equal to the number of the second synchronization signals.

[0040] In combination with the second aspect, in some implementations of the second aspect, the second synchronization signal has the same frequency domain center point as the first synchronization signal.

[0041] In combination with the second aspect, in some implementations of the second aspect, the first synchronization signal includes a synchronization signal generated based on the physical cell identifier (PCI) or a part of the content of the PCI, and the second synchronization signal includes a synchronization signal generated based on the PCI or a part of the content of the PCI.

[0042] In combination with the second aspect, in some implementations of the second aspect, the first synchronization signal includes the primary synchronization signal (PSS), and the second synchronization signal includes the secondary synchronization signal (SSS).

[0043] In combination with the second aspect, in some implementations of the second aspect, the sequence length of the primary synchronization signal is greater than the sequence length of the secondary synchronization signal.

[0044] In combination with the second aspect, in some implementations of the second aspect, the first synchronization signal includes the primary synchronization signal (PSS), the second synchronization signal includes the synchronization signal block (SSB), the SSB includes the second primary synchronization signal, the second primary synchronization signal corresponds one-to-one with the first primary synchronization signal, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal.

[0045] In combination with the second aspect, in some implementations of the second aspect, the sequence length of the first primary synchronization signal is greater than the sequence length of the second primary synchronization signal.

[0046] In combination with the second aspect, in some implementations of the second aspect, transmitting the first synchronization signal includes: repeatedly transmitting the first synchronization signal on multiple frequency bands.

[0047] In a third aspect, a communication device is provided, which includes: a transceiver unit for receiving the first synchronization signal; the transceiver unit is further configured to receive the second synchronization signal, the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal.

[0048] In combination with the third aspect, in some implementations of the third aspect, within a first time period, the number of the first synchronization signals is greater than or equal to the number of the second synchronization signals.

[0049] In combination with the third aspect, in some implementations of the third aspect, receiving the second synchronization signal includes: receiving the second synchronization signal based on the received first synchronization signal.

[0050] In combination with the third aspect, in some implementations of the third aspect, receiving the second synchronization signal based on the received first synchronization signal includes: receiving the second synchronization signal based on the reception beam direction of the first synchronization signal or the reception beam codebook of the first synchronization signal.

[0051] In combination with the third aspect, in some implementations of the third aspect, the second synchronization signal has the same center frequency point in the frequency domain as the first synchronization signal.

[0052] In combination with the third aspect, in some implementations of the third aspect, the first synchronization signal includes a synchronization signal generated based on the physical cell identifier (PCI) or a part of the PCI, and the second synchronization signal includes a synchronization signal generated based on the PCI or a part of the PCI.

[0053] In combination with the third aspect, in some implementations of the third aspect, the first synchronization signal includes the primary synchronization signal (PSS), and the second synchronization signal includes the secondary synchronization signal (SSS).

[0054] In combination with the third aspect, in some implementations of the third aspect, the sequence length of the PSS is greater than the sequence length of the SSS.

[0055] In combination with the third aspect, in some implementations of the third aspect, the first synchronization signal includes a first primary synchronization signal, and the second synchronization signal includes a synchronization signal broadcast block (SSB).

[0056] In combination with the third aspect, in some implementations of the third aspect, receiving the second synchronization signal includes: receiving the second primary synchronization signal in the SSB according to the received first primary synchronization signal, where the second primary synchronization signal corresponds one-to-one with the first primary synchronization signal, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal.

[0057] In combination with the third aspect, in some implementations of the third aspect, the sequence length of the first primary synchronization signal is greater than the sequence length of the second primary synchronization signal.

[0058] In combination with the third aspect, in some implementations of the third aspect, receiving the second synchronization signal further includes: receiving the secondary synchronization signal (SSS) in the SSB according to the received second primary synchronization signal.

[0059] In combination with the third aspect, in some implementations of the third aspect, the device further includes a processing unit, and the processing unit is used to receive the physical broadcast channel (PBCH) according to the second primary synchronization signal and the SSS.

[0060] In combination with the third aspect, in some implementations of the third aspect, the first synchronization signal is repeatedly transmitted on multiple frequency bands.

[0061] In combination with the third aspect, in some implementations of the third aspect, the transceiver unit is further used to receive the SSS in the second symbol after receiving the PSS.

[0062] In combination with the third aspect, in some implementations of the third aspect, the transceiver unit is further used to receive the second primary synchronization signal in the first symbol after receiving the first synchronization signal.

[0063] In combination with the third aspect, in some implementation manners of the third aspect, the transceiver unit is further configured to receive the SSS in the second symbol after receiving the second primary synchronization signal.

[0064] In combination with the third aspect, in some implementation manners of the third aspect, the transceiver unit is further configured to repeatedly transmit the first synchronization signal in the time domain.

[0065] In a fourth aspect, a communication device is provided, including: a transceiver unit, where the transceiver unit is configured to transmit a first synchronization signal; the transceiver unit is further configured to transmit a second synchronization signal, the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal.

[0066] In combination with the fourth aspect, in some implementation manners of the fourth aspect, within a first time length, the number of the first synchronization signals is greater than or equal to the number of the second synchronization signals.

[0067] In combination with the fourth aspect, in some implementation manners of the fourth aspect, the second synchronization signal has the same frequency domain center point as the first synchronization signal.

[0068] In combination with the fourth aspect, in some implementation manners of the fourth aspect, the first synchronization signal includes a synchronization signal generated according to a physical cell identifier (PCI) or a part of the content of the PCI, and the second synchronization signal includes a synchronization signal generated according to the PCI or a part of the content of the PCI.

[0069] In combination with the fourth aspect, in some implementation manners of the fourth aspect, the first synchronization signal includes a first primary synchronization signal (PSS), and the second synchronization signal includes a secondary synchronization signal (SSS).

[0070] In combination with the fourth aspect, in some implementation manners of the fourth aspect, the sequence length of the primary synchronization signal is greater than the sequence length of the secondary synchronization signal.

[0071] In combination with the fourth aspect, in some implementation manners of the fourth aspect, the first synchronization signal includes a first primary synchronization signal (PSS), the second synchronization signal includes a synchronization signal broadcast block (SSB), the SSB includes a second primary synchronization signal, the second primary synchronization signal corresponds to the first primary synchronization signal one by one, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal.

[0072] In combination with the fourth aspect, in some implementation manners of the fourth aspect, the sequence length of the first primary synchronization signal is greater than the sequence length of the second primary synchronization signal.

[0073] In combination with the fourth aspect, in some implementation manners of the fourth aspect, transmitting the first synchronization signal includes: repeatedly transmitting the first synchronization signal on multiple frequency bands.

[0074] In a fifth aspect, a communication device is provided, including: a processor coupled to a memory for storing a computer program, and the processor is configured to run the computer program so that the communication device executes the method in the first aspect and any possible implementation manner thereof as described above.

[0075] In a sixth aspect, a communication device is provided, including: a processor coupled to a memory for storing a computer program, and the processor is configured to run the computer program so that the communication device executes the method in the second aspect and any possible implementation manner thereof as described above.

[0076] In a seventh aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a computer, the computer is caused to execute the communication method in the first aspect and any possible implementation manner in the first aspect, or the second aspect and any possible implementation manner in the second aspect.

[0077] In an eighth aspect, a computer program product including instructions is provided. When the computer program product runs on a computer, the computer is caused to execute the communication method in the first aspect and any possible implementation manner in the first aspect, or the second aspect and any possible implementation manner in the second aspect.

[0078] In a ninth aspect, a chip is provided, which includes a processor and a data interface. The processor reads instructions stored in a memory through the data interface to execute the communication method in the first aspect and any possible implementation manner in the first aspect, or the second aspect and any possible implementation manner in the second aspect.

[0079] In combination with the ninth aspect, in a possible implementation manner, the processor is coupled to the memory through an interface.

[0080] In combination with the ninth aspect, in a possible implementation manner, the chip system further includes a memory, and a computer program or computer instructions are stored in the memory. Description of the Drawings

[0081] Figure 1 It is a schematic diagram of a system architecture.

[0082] Figure 2 It is a schematic diagram of an SSB set pattern.

[0083] Figure 3 It is another schematic diagram of an SSB set pattern.

[0084] Figure 4 It is a schematic diagram of a broadcast signal design provided by an embodiment of the present application.

[0085] Figure 5 It is a schematic diagram of a broadcast signal structure provided by an embodiment of the present application.

[0086] Figure 6 This is a flowchart for the initial access of a terminal device provided by an embodiment of the present application.

[0087] Figure 7 This is another schematic diagram of a broadcast signal design provided by an embodiment of the present application.

[0088] Figure 8 This is yet another schematic diagram of a broadcast signal design provided by an embodiment of the present application.

[0089] Figure 9 This is another schematic diagram of the structure of a broadcast signal provided by an embodiment of the present application.

[0090] Figure 10 This is another flowchart for the initial access of a terminal device provided by an embodiment of the present application.

[0091] Figure 11 This is yet another schematic diagram of a broadcast signal design provided by an embodiment of the present application.

[0092] Figure 12 This is a schematic diagram of the structure of a communication device provided by an embodiment of the present application.

[0093] Figure 13 This is a schematic diagram of a communication architecture provided by an embodiment of the present application. Detailed implementation manners

[0094] Next, the technical solutions in the present application will be described with reference to the accompanying drawings.

[0095] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: the 5th generation (5G) or new radio (NR) system, the long term evolution (LTE) system, the LTE frequency division duplex (FDD) system, the LTE time division duplex (TDD) system, etc. The technical solutions provided by the present application can also be applied to future communication systems, such as the 6th generation (6G) mobile communication system. The technical solutions provided by the present application can also be applied to device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine (M2M) communication, machine type communication (MTC), and the Internet of Things (IoT) communication system. The technical solutions provided by the present application can also be applied to low-frequency scenarios, high-frequency scenarios, terahertz, optical communication, licensed bands, and can also be used in unlicensed bands, etc.

[0096] The terminal devices in the embodiments of the present application (e.g., user equipment (UE)) include various devices with wireless communication functions, which can be used to connect people, objects, machines, etc. Terminal devices can be widely applied to various scenarios, such as: cellular communication, D2D, V2X, peer to peer (P2P), M2M, MTC, IoT, virtual reality (VR), augmented reality (AR), industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearables, smart transportation, smart city drones, robots, remote sensing, passive sensing, positioning, navigation and tracking, autonomous delivery and other scenarios. The terminal device can be a terminal in any of the above scenarios, such as an MTC terminal, an IoT terminal, etc. The terminal device can be a user equipment (UE), a terminal, a fixed device, a mobile station device or a mobile device, a subscriber unit, a handheld device, a vehicle-mounted device, a wearable device, a cellular phone, a smart phone, a SIP phone, a wireless data card, a personal digital assistant (PDA), a computer, a tablet computer, a laptop computer, a wireless modem, a handset, a laptop computer, a computer with wireless transceiver function, a smart book, a vehicle, a satellite, a global positioning system (GPS) device, a target tracking device, an aircraft (such as a drone, a helicopter, a multi-helicopter, a quadcopter, or an airplane, etc.), a ship, a remote control device, a smart home device, an industrial device, or a device built into the above devices (e.g., a communication module, a modem or a chip in the above devices), or other processing devices connected to a wireless modem. It should be understood that in some scenarios, the terminal device can also be used as a base station. For example, the terminal device can act as a scheduling entity, which provides sidelink signals between terminal devices in scenarios such as V2X, D2D or P2P.

[0097] The network device in the embodiments of the present application can be a device for communicating with a terminal device. This network device can also be referred to as an access network device or a radio access network device. For example, the network device can be a base station. The network device in the embodiments of the present application can refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. The base station can generally cover various names as follows, or be replaced with the following names, such as: Node B, evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point, master station, slave station, multi-mode radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, or radio unit (RU), etc. The base station can be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. The base station can also refer to a communication module, a modem, or a chip disposed in the foregoing device or apparatus. The base station can also be a mobile switching center and a device that undertakes the base station function in D2D, V2X, M2M communications, a network-side device in a 6G network, a device that undertakes the base station function in a future communication system, etc. The base station can support networks of the same or different access technologies. The embodiments of the present application do not limit the specific technologies and specific device forms adopted by the network device.

[0098] The base station can be fixed or mobile. For example, a helicopter or a drone can be configured to act as a mobile base station, and one or more cells can move according to the position of the mobile base station. In other examples, a helicopter or a drone can be configured to be used as a device for communicating with another base station.

[0099] In some deployments, the network device mentioned in the embodiments of this application may be an access network device in an open radio access network (O-RAN), or a cloud radio access network (CRAN). Alternatively, the network device may also be a satellite in a satellite communication system.

[0100] In some deployments, the network device mentioned in the embodiments of this application may also be a device including a CU, or a DU, or a device including a CU and a DU, or a control plane CU node (central unit-control plane, CU-CP) and a user plane CU node (central unit-user plane, CU-UP) and a DU node.

[0101] It should be noted that in different systems, the CU (or CU-CP and CU-UP), DU, or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, the CU may also be referred to as an open centralized unit (O-CU) or an open CU, the DU may also be referred to as an open distributed unit (O-DU), the CU-CP may also be referred to as an open centralized unit control plane (O-CU-CP), the CU-UP may also be referred to as an open centralized unit user plane (O-CU-UP), and the RU may also be referred to as an open radio unit (O-RU). Specifically, this application does not make any limitations. Any one of the CU, CU-CP, CU-UP, DU, and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0102] Optionally, for network elements in the ORAN system, each network element may implement the protocol layer functions as shown in Table 1 below.

[0103] Table 1

[0104]

[0105] It should be noted that in the ORAN system, the network device in this application may be one or more network elements in Table 1 above.

[0106] The embodiments of the present application do not particularly limit the specific structure of the execution subject of the method provided by the embodiments of the present application. As long as it can communicate according to the method provided by the embodiments of the present application by running a program that records the code of the method provided by the embodiments of the present application. For example, the execution subject of the method provided by the embodiments of the present application can be a terminal device or a network device, or a functional module in the terminal device or the network device that can call and execute the program.

[0107] In addition, various aspects or features of the present application can be implemented as a method, an apparatus, or an article of manufacture using standard programming and / or engineering techniques. The term "article of manufacture" used in the present application covers a computer program accessible from any computer-readable device, carrier, or medium. For example, the computer-readable medium can include, but is not limited to: magnetic storage devices (such as hard disks, floppy disks, or magnetic tapes, etc.), optical discs (such as compact discs (CDs), digital versatile discs (DVDs), etc.), smart cards, and flash memory devices (such as erasable programmable read-only memories (EPROMs), cards, sticks, or key drives, etc.). In addition, the various storage media described herein can represent one or more devices and / or other machine-readable media for storing information.

[0108] The embodiments of the present application do not particularly limit the specific structure of the execution subject of the method provided by the embodiments of the present application. As long as it can communicate according to the method provided by the embodiments of the present application by running a program that records the code of the method provided by the embodiments of the present application. For example, the execution subject of the method provided by the embodiments of the present application can be a terminal device or a network device, or a functional module in the terminal device or the network device that can call and execute the program.

[0109] Before introducing the solutions of the embodiments of the present application, the following points are explained.

[0110] (1) In the embodiments of the present application, "indication" can include direct indication, indirect indication, display indication, and implicit indication. When it is described that a certain indication information is used to indicate A, it can be understood that the indication information carries A, directly indicates A, or indirectly indicates A.

[0111] In the embodiments of the present application, the information indicated by the indication information is referred to as the information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated. For example, but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated. It is also possible to indirectly indicate the information to be indicated by indicating other information, where there is an association relationship between the other information and the information to be indicated. It is also possible to only indicate a part of the information to be indicated, while the other parts of the information to be indicated are known or pre-agreed. For example, it is also possible to use the arrangement order of each piece of information pre-agreed (such as stipulated in the protocol) to indicate specific information, thereby reducing the indication overhead to a certain extent. In addition, the information to be indicated can be sent as a whole, or can be divided into multiple sub-information and sent separately, and the sending periods and / or sending times of these sub-information can be the same or different.

[0112] (2) In the embodiments of the present application, "sending" and "receiving" represent the direction of signal transmission. For example, "sending information to XX" can be understood as the destination of the information is XX, which can include directly sending through the air interface, and also includes indirectly sending through the air interface by other units or modules. "Receiving information from YY" can be understood as the source of the information is YY, which can include directly receiving from YY through the air interface, and can also include indirectly receiving from YY through the air interface from other units or modules. "Sending" can also be understood as the "output" of the chip interface, and "receiving" can also be understood as the "input" of the chip interface. In other words, sending and receiving can be carried out between devices. For example, between a network device and a terminal device, or can be carried out within a device. For example, sending or receiving between components, modules, chips, software modules or hardware modules within a device through a bus, trace or interface.

[0113] The following introduces the technical terms involved in the embodiments of the present application.

[0114] Non-terrestrial network (NTN): Such as satellite communication, which has the advantages of wide coverage, long communication distance, high reliability, high flexibility, high throughput, etc., is not affected by geographical environment, climate conditions and natural disasters, and has been widely used in fields such as aviation communication, maritime communication, and military communication. Introducing satellites into the new air interface technology of future fifth-generation mobile communication can provide communication services for areas difficult to cover by terrestrial networks, such as the ocean and forests, can enhance the reliability of 5G communication, such as providing more stable and high-quality communication services for trains, airplanes and users on these means of transportation, and can also provide more data transmission resources to support a larger number of connections.

[0115] Beam: It can be understood as a spatial filter or spatial parameters. The beam used for transmitting signals can be called a transmission beam (Tx beam), which can be a spatial domain transmit filter or spatial transmit parameters (spatial Tx parameters), or a spatial transmit angle (such as azimuth, zenith) or a spatial transmit angle range (such as azimuth center angle and offset, azimuth uncertainty, azimuth protection range, zenith center angle and offset, zenith uncertainty, zenith protection range), etc.; the beam used for receiving signals can be called a reception beam (Rx beam), which can be a spatial domain receive filter or spatial receive parameters (spatial Rx parameters), or a spatial receive angle (such as azimuth, zenith) or a spatial receive angle range (such as azimuth center angle and offset, azimuth uncertainty, azimuth protection range, zenith center angle and offset, zenith uncertainty, zenith protection range), etc.

[0116] The technology for forming a beam can be beamforming technology or other technologies. For example, beamforming technology can specifically be digital beamforming technology, analog beamforming technology, or hybrid digital / analog beamforming technology, etc. The transmission beam can refer to the distribution of signal intensity formed in different directions in space after the signal is transmitted by the antenna, and the reception beam can refer to the signal intensity distribution of the wireless signal received by the antenna in different directions in space. The beamforming technology in the embodiments of the present application can be implemented based on a power amplifier of a new material or based on a new antenna architecture, such as new hybrid phased array and lens antenna technology.

[0117] In the 5G-NR protocol, a beam can be a spatial filter. However, it should be understood that the present application does not exclude the possibility of defining other terms in future protocols to represent the same or similar meanings.

[0118] Antenna panel: Briefly referred to as panel. Each antenna panel can be configured with one or more receiving beams and one or more transmitting beams. Therefore, an antenna panel can also be understood as a beam group. A communication device, such as a terminal device or a network device, can receive signals through the receiving beams on the antenna panel and can also transmit signals through the transmitting beams on the antenna panel.

[0119] Figure 1 It is a schematic diagram of a system architecture. It should be understood that the scenarios in which the method of the embodiments of the present application can be used may include more or fewer devices or apparatuses, or may include devices or apparatuses with similar functions. Figure 1 The shown system architecture includes a network device 111 (which may include a single or multiple network devices), and terminal devices 121 and 122 (which may include a single or multiple terminal devices). Among them, both the network device and the terminal device can have high-frequency and low-frequency communication capabilities. It should be noted that, for the communication method provided by the embodiments of the present application, a single network device and multiple terminal devices can be taken as an example, and the network device can transmit data or control signaling to the terminal device.

[0120] In the communication scenario of NTN, due to the long communication distance of the network device and the poor link budget, in order to meet high-throughput services such as broadband video transmission, the terminal device usually uses a phased array narrow beam to align with the network device to improve the receiving gain. For example, the narrow beam width is 1° to 3°. When the vehicle-mounted phased array terminal device is moving at high speed, the bumps on the road surface or vehicle steering, etc. will cause rapid changes in the three-axis attitude, and the jitter of the phased array will bring jitter in the beam direction, and this kind of jitter exists normally. In order to maintain the accurate pointing of the narrow beam, it is necessary to improve the beam alignment mechanism in the NTN scenario. On the one hand, quickly search for satellites in the initial access stage, and on the other hand, maintain the stable tracking of the beam in the data transmission stage. And the satellite provides services based on the beam, and single-stream transmission is adopted under a single beam. Therefore, satellite terminals often use a single radio frequency channel to save costs, which brings greater difficulties to beam alignment.

[0121] In the initial access stage of the terrestrial cellular system, the network device sends a set of synchronization signal / PBCH blocks (SSB) at a certain period. The SSB set can include multiple SSBs, and each SSB corresponds to a beam direction.

[0122] Specifically, the SSB is one of the common pilot channels and can be used in many aspects for the terminal device to access the network device, such as cell search, beam measurement, beam selection, beam recovery and other specific aspects.

[0123] Exemplarily, the transmission period of the SSB set can be 5 ms, 10 ms, 20 ms, 40 ms, 80 ms, 160 ms, etc.

[0124] Figure 2 is a schematic diagram of the SSB set pattern.

[0125] Please refer to Figure 2 , an SSB can occupy 4 symbols, which include the primary synchronization signal (PSS), secondary synchronization signal (SSS), and physical broadcast channel (PBCH). Among them, the PSS is located in the first symbol of the SSB to help the terminal device obtain the radio frame boundary. The m sequence of the PSS can consist of 127 values, mapped to 127 subcarriers. The terminal device can determine whether the beam direction between the terminal device and the network device is aligned by detecting whether the PSS is detected. The SSS can be a combination of m sequences. For example, the SSS can include 336 indexes, and the terminal device can parse the information in the SSB according to the information in the SSS. The PBCH can include system information, and the terminal device can decode the PBCH based on the PSS and SSS.

[0126] Furthermore, the terminal device adjusts the beam direction and tries to search for the PSS in the SSB in different directions. When the beam of the network device transmitting the SSB covers the terminal device and the power of the SSB signal received by the beam of the terminal device is strong enough, the terminal device can detect the PSS and complete the access.

[0127] Furthermore, an SSB set can exist within a 5 - ms half - frame, and the pattern of the SSB set is related to the operating frequency band of the system.

[0128] Specifically, Figure 2 the SSB set pattern shown is applicable to a 15 - kHz sub - carrier spacing. When the carrier frequency is less than 3 GHz, an SSB set can contain 4 SSBs, occupying the first 2 time slots of the half - frame, and each time slot contains 2 SSBs. When the carrier frequency is greater than 3 GHz, an SSB set can contain 8 SSBs, occupying the first 4 time slots of the half - frame, and each time slot contains 2 SSBs.

[0129] Please continue to refer to Figure 2 , the pattern of the SSB in each time slot is the same. Among them, since it is necessary to reserve the first two symbols in a time slot for the downlink control channel and the last two symbols for the uplink control channel, therefore Figure 2In one time slot with a 15 kHz subcarrier spacing as shown, symbols 0, 1, 12, and 13 do not map to SSB. At the same time, in order to coexist with a 30 kHz subcarrier spacing, symbols 6 and 7 in one time slot with a 15 kHz subcarrier spacing also do not map to SSB, and are reserved for the uplink control channel and the downlink control channel with a 30 kHz subcarrier spacing respectively.

[0130] Figure 3 is another schematic diagram of the SSB set pattern.

[0131] Specifically, Figure 3 The SSB set pattern as shown is applicable to a 30 kHz subcarrier spacing. When the carrier frequency is less than 3 GHz, one SSB set can contain 4 SSBs, occupying the first time slot pair of a half-frame, and one time slot pair contains 2 time slots. When the carrier frequency is greater than 3 GHz, one SSB set can contain 8 SSBs, occupying the first 2 time slot pairs of a half-frame.

[0132] Please continue to refer to Figure 3 , the SSB pattern within each time slot pair is the same. Among them, since it is necessary to reserve the first two symbols in one time slot for the downlink control channel and the last two symbols for the uplink control channel, Figure 3 in the first time slot and the second time slot within one time slot pair with a 30 kHz subcarrier spacing as shown, symbols 0, 1, 12, and 13 do not map to SSB.

[0133] In a non-terrestrial network scenario, the network device and the terminal device need to perform beam alignment for subsequent data transmission. During the beam alignment process, when the terminal device initially accesses, it can adjust the beam direction at a certain period, continuously change the direction of the receiving beam of the terminal device to try to search for SSB. When the number of transmit beam directions that the network device needs to scan is large, and the number of selectable receiving beam directions of the phased array terminal is large, such as up to hundreds of beam directions, the terminal device needs to complete beam scanning in a large number of directions to achieve alignment with the satellite. Especially in the scenario where both the low-earth orbit satellite and the vehicle-mounted terminal are moving at high speeds, the initial access process will be even more lengthy and it may even be difficult to access.

[0134] In view of the above problems, the embodiments of the present application provide a communication method and device, which can reduce the time required for the terminal device during initial access.

[0135] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings.

[0136] Figure 4 is a schematic diagram of a broadcast signal design provided by the embodiments of the present application.

[0137] Specifically, Figure 4The schematic diagram of the broadcast signal design shown takes the scenario with a subcarrier spacing of 15 kHz as an example. The second synchronization signal can be located in the second signal set, and the second signal set can include 4 second synchronization signals, occupying the first 2 time slots of one and a half frames. The first synchronization signal can be located in the first signal set, and the first signal set can include multiple Figure 4 time slots containing the first synchronization signal as shown.

[0138] In a possible implementation, the network device sends the first synchronization signal; the network device sends the second synchronization signal. The width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of the transmission beams of multiple second synchronization signals. Correspondingly, the terminal device receives the first synchronization signal; the terminal device receives the second synchronization signal. The width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of the transmission beams of multiple second synchronization signals.

[0139] It should be understood that since the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of the transmission beams of multiple second synchronization signals, the first synchronization signal in the embodiments of this application can also be referred to as a wide beam synchronization signal, a wide beam signal, or a wide beam, and the second synchronization signal can also be referred to as a narrow beam synchronization signal, a narrow beam signal, or a narrow beam. The embodiments of this application do not limit their names.

[0140] Specifically, for the pattern design of the first synchronization signal and the second synchronization signal, please refer to Figure 4 , Figure 4 where the first synchronization signal is located at symbol 2 and symbol 8 in one time slot, and the network device uses a wide beam for transmission at symbol 2 and symbol 8; Figure 4 where the second synchronization signal is located at symbols 3 to 5 and symbols 9 to 11 in this time slot, and the network device uses a narrow beam for transmission at symbols 3 to 5 and symbols 9 to 11, that is, the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of the transmission beams of multiple second synchronization signals.

[0141] It should be understood that the specific positions of the first synchronization signal and the second synchronization signal in the embodiments of this application are only taken as an example, and the embodiments of this application do not limit this.

[0142] In the embodiments of the present application, the terminal device receives a first synchronization signal and a second synchronization signal sent by a network device. The width of the transmission beam of the first synchronization signal is greater than that of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal, such that the number of first synchronization signals covering the terminal device within a period of time is greater than the number of second synchronization signals covering the terminal device. Therefore, when the terminal device adjusts the direction of the receiving beam to attempt to receive the synchronization signal of the network device, it can search for the first synchronization signal more quickly compared to directly searching for the second synchronization signal. Thus, the receiving beam of the terminal device can be aligned with the network device faster, reducing the time required for the terminal device during the initial access process.

[0143] In the embodiments of the present application, the first synchronization signal is transmitted using a beam wider than that of the second synchronization signal, which can increase the coverage range of the transmission beam of the first synchronization signal mapped on the ground, thereby reducing the time when the transmission beam cannot cover the location of the terminal device due to beam hopping, and preventing the terminal device from being unable to accurately point to the network device and not receiving the downlink signal sent by the network device due to too long a beamless service time.

[0144] In a possible implementation, the first synchronization signal includes a synchronization signal generated according to the physical cell identities (PCI) or a part of the PCI content, and the second synchronization signal includes a synchronization signal generated according to the PCI or a part of the PCI content.

[0145] Exemplarily, the calculation formula of the PCI is as follows:

[0146]

[0147] where It is carried in the PSS. The PSS is an m-sequence with a length of 127, and the generation formula of the sequence is:

[0148] d pSS (n) = 1 - 2x(m)

[0149]

[0150] 0 ≤ n < 127

[0151] x(i + 7) = [x(i + 4) + x(i)] mod 2

[0152] [x(6)x(5)x(4)x(3)x(2)x(1)x(0)] = [1 1 1 0 1 1 0]

[0153] The bearing is in the SSS, and the SSS is a gold sequence with a length of 127. The generation formula of the sequence is:

[0154] d sss (n) = {1 - 2x0[(n + m0) mod 127]}{1 - 2x1[(n + m1) mod 127]}

[0155]

[0156]

[0157] 0 ≤ n < 127

[0158] x0(i + 7) = [x0(i + 4) + x0(i)] mod 2

[0159] x1(i + 7) = [x1(i + 1) + x1(i)] mod 2

[0160] [x0(6)x0(5)x0(4)x0(3)x0(2)x0(1)x0(0)] = [0 0 0 0 0 0 1]

[0161] [x1(6)x1(5)x1(4)x1(3)x1(2)x1(1)x1(0)] = [0 0 0 0 0 0 1]

[0162] It should be understood that the first synchronization signal may also be other forms of signals with the same function as the PSS, and the second synchronization signal may also be other forms of signals with the same function as the SSS and the PBCH. The embodiments of the present application do not limit this.

[0163] In a possible implementation manner, the first synchronization signal includes the PSS, and the second synchronization signal includes the SSS.

[0164] It should be understood that when the first synchronization signal is the PSS, the first synchronization signal may also be referred to as the wide-beam PSS. When the second synchronization signal includes the SSS, the SSS may be referred to as the narrow-beam SSS. The present application does not limit the specific names.

[0165] Specifically, please continue to refer to Figure 4 , the second synchronization signal may be symbols 1 to 3 in the SSB, that is, other symbols in the SSB except the 0th symbol.

[0166] It should be understood that Figure 4 the structure of the SSB shown is only an example, and the embodiments of the present application do not specifically limit the specific structure and time domain position of the first synchronization signal and the second synchronization signal.

[0167] It should also be understood that Figure 4The signal content of the SSB shown is only an example. The first synchronization signal and the second synchronization signal are two non-overlapping synchronization signals in time domain for beam alignment. In the embodiments of the present application, the content of the first synchronization signal and the second synchronization signal is not specifically limited.

[0168] In a possible implementation, within the first time length, the number of the first synchronization signals is greater than or equal to the number of the second synchronization signals.

[0169] Specifically, the first synchronization signal may be located in the first signal set, and the first signal set may be continuously transmitted normally; the second synchronization signal may be located in the second signal set, and the second signal set may be transmitted periodically. Since the first synchronization signal is transmitted using a wide beam and the second synchronization signal is transmitted using a narrow beam, within a period of time, the number of transmission beams of the first synchronization signal covering the terminal device is greater than the number of transmission beams of the second synchronization signal covering the terminal device.

[0170] Optionally, the transmission period of the first signal set may be the same as the time domain length of the first signal set. For example, when the first signal set includes 5 time slots, the transmission period of the first signal set is 5 time slots, that is, the transmission period of the first signal set is 5 ms, or it can be said that the first signal set is transmitted normally.

[0171] Optionally, the transmission period of the first signal set may also be greater than the time domain length of the first signal set and less than or equal to the transmission period of the second signal set. For example, the first signal set includes 5 time slots, and the transmission period of the second signal set is 20 ms. At this time, the transmission period of the first signal set may also be 10 time slots, that is, the transmission period of the first signal set is 10 ms.

[0172] It should be understood that in the embodiments of the present application, within the first time length, the number of the first synchronization signals is greater than or equal to the number of the second synchronization signals, but there is no direct association between the transmission period of the first signal set and the transmission period of the second signal set.

[0173] It should be understood that the first signal set including 5 time slots is only an example. The first signal set may also include 1 time slot, 2 time slots, 10 time slots, etc. The present application does not limit this.

[0174] Further, please continue to refer to Figure 4, in a scenario with a subcarrier spacing of 15 kHz, within one time slot of the first signal set, the time domain positions of the first synchronization signal are symbol 2 and symbol 8. When the second synchronization signal in the second signal set sent by the network device is adjacent in the time domain to the first synchronization signal in the first signal set sent by the network device, that is, when the second synchronization signal is sent after the first synchronization signal, the network device sends the first synchronization signal in the first signal set at symbol 2 and symbol 8, and sends at symbols 3 to 5 and symbols 9 to 11 in the narrow beam directions corresponding to the wide beam direction of the first synchronization signal Figure 4 The second to fourth symbols in the SSB shown in

[0175] Further, in the scenario with a subcarrier spacing of 15 kHz as shown in Figure 4 , within one time slot of the first signal set, the time domain positions of the first synchronization signal are symbol 2 and symbol 8. Since within the first time length, the number of second synchronization signals can be less than the number of first synchronization signals, when the first signal set and the second signal set sent by the network device do not correspond to the same time domain, the network device only sends the first synchronization signal at symbol 2 and symbol 8, and there is no need to send the second synchronization signal corresponding to symbols 3 to 5 and symbols 9 to 11.

[0176] In a possible implementation, the second synchronization signal is after the first synchronization signal, and the second synchronization signal is adjacent to the first synchronization signal in the time domain.

[0177] Specifically, Figure 4 One first signal set in

[0178] Exemplarily, please continue to refer to Figure 4 , in the first signal set, the position of the first synchronization signal in the first signal set is adjacent to the time domain position of the second synchronization signal in the second signal set. Figure 4 In the first time slot in

[0179] In the embodiments of the present application, the second synchronization signal is adjacent to the corresponding first synchronization signal in the time domain, so that the terminal device can immediately detect the second synchronization signal after detecting the first synchronization signal, that is, the terminal device can detect the second synchronization signal in adjacent and determined time domains, reducing the system overhead of the terminal device.

[0180] In a possible implementation, the second synchronization signal has the same frequency-domain center point as the first synchronization signal.

[0181] Specifically, please refer to Figure 4 , Figure 4 where the first synchronization signal can be the PSS. The frequency-domain center point of the PSS is aligned with the frequency-domain center point of the synchronization signal within each symbol of the second synchronization signal. For example, the PSS is aligned with the frequency-domain center point of the frequency band occupied by the PBCH in symbol 1 and symbol 3, or the PSS is aligned with the frequency-domain center point of the frequency band occupied by the SSS in symbol 2.

[0182] In the embodiments of the present application, the terminal device can detect the second synchronization signal in a frequency band with the same frequency-domain center point after detecting the first synchronization signal, thereby reducing the detection overhead of the terminal device.

[0183] Figure 5 is a schematic diagram of a broadcast signal structure provided by the embodiments of the present application.

[0184] In a possible implementation, the sequence length of the PSS is greater than the sequence length of the SSS.

[0185] Specifically, since the first synchronization signal is transmitted using a wide beam, and the wide beam will lose beam gain, therefore, the network device can use a longer sequence to enhance the beam alignment performance.

[0186] Please refer to Figure 4 and Figure 5 , Figure 5 The broadcast signal structure shown can be used in Figure 4 the frame structure of the broadcast signal design shown. Figure 4 The sequence of the first synchronization signal shown can be an m-sequence, where the length of the m-sequence is 2 N - 1, Figure 4 The broadcast signal structure in Figure 5 can be replaced with the broadcast signal structure shown in Figure 4 , that is, the sequence of the first synchronization signal in

[0187] Exemplarily, Figure 4 and Figure 5 the sequence of the PSS in can use an m-sequence with a length of 255.

[0188] In the embodiments of the present application, since the beam width of the PSS is greater than that of the SSS, and the wide beam will cause loss of beam gain, when the network device sends the PSS, a sequence with a length greater than that of the SSS is used, which enables the terminal device to obtain a higher detection peak when detecting the PSS, increases the accuracy of the terminal device to confirm the reception of the PSS, thereby enhancing the beam alignment performance between the terminal device and the network device and overcoming the loss of beam gain caused by the wide beam.

[0189] In a possible implementation manner, the network device repeatedly sends the first synchronization signal on multiple frequency bands.

[0190] Specifically, since the broadcast signal for beam alignment, that is, the wide beam PSS, is sent using a wide beam, and the wide beam will cause loss of beam gain, therefore, the network device can repeatedly send the first synchronization signal on multiple frequency bands to enhance the beam alignment performance.

[0191] Exemplarily, please continue to refer to Figure 4 , the network device can send the first synchronization signal using a wide beam on multiple frequency bands at the positions of symbol 2 and symbol 8 in a time slot. Correspondingly, the terminal device can search for the first synchronization signal on multiple frequency bands, so that the terminal device can receive a larger number of first synchronization signals within a certain period of time.

[0192] Furthermore, the first synchronization signals repeatedly sent by the network device on multiple frequency domains can be the same sequence or different sequences carrying the same information.

[0193] Exemplarily, please continue to refer to Figure 4 , the network device can send the first synchronization signal using a wide beam on multiple frequency bands at the positions of symbol 2 and symbol 8 in a time slot. The network device can also send PSS1 on one of the frequency bands and send PSS2 on another frequency band. Both PSS1 and PSS2 use the same However, the specific sequence forms can be different.

[0194] In the embodiments of the present application, since the beam width of the first synchronization signal is greater than that of the second synchronization signal, and the wide beam will cause loss of beam gain, the network device repeatedly sending the first synchronization signal on multiple frequency bands enables the terminal device to receive a larger number of first synchronization signals within a certain period of time, increasing the chance for the terminal device to receive the first synchronization signal with the required power, thereby reducing the time required for the terminal device in the initial access process.

[0195] In a possible implementation manner, the network device repeatedly sends the first synchronization signal in the time domain.

[0196] Specifically, since the broadcast signal for beam alignment, i.e., the wide-beam PSS, is transmitted using a wide beam, and the wide beam will result in a loss of beam gain, the network device can enhance the beam alignment performance by repeatedly transmitting the first synchronization signal in the time domain.

[0197] Exemplarily, please continue to refer to Figure 4 , the network device can reuse the wide beam to transmit the first synchronization signal at the positions of symbol 2 and symbol 3 in a time slot. Adaptively, the network device can transmit the second synchronization signal from symbol 4 to symbol 6, so that there can be more wide-beam first synchronization signals covering the terminal device within a certain period of time.

[0198] Furthermore, the first synchronization signal repeatedly transmitted by the network device in the time domain can be the same sequence or different sequences carrying the same information.

[0199] Exemplarily, please continue to refer to Figure 4 , the network device can reuse the wide beam to transmit the first synchronization signal at the positions of symbol 2 and symbol 3 in a time slot, where the network device transmits PSS1 at symbol 2 and transmits PSS2 at symbol 3, and both PSS1 and PSS2 use the same but the specific sequence forms can be different.

[0200] In the embodiments of the present application, since the beam width of the first synchronization signal is greater than that of the second synchronization signal, and the wide beam will cause a loss of beam gain, the network device repeatedly transmitting the first synchronization signal in the time domain can have more wide-beam first synchronization signals covering the terminal device within a certain period of time, increasing the chance for the terminal device to receive the first synchronization signal with the required power, thereby reducing the time required for the terminal device in the initial access process.

[0201] Figure 6 is a flowchart of an initial access process 600 of a terminal device provided by the embodiments of the present application.

[0202] It should be understood that Figure 6 in the initial access process of the terminal device shown, the pattern of the synchronization signal block takes Figure 4 as an example, that is, the first synchronization signal takes the wide-beam PSS as an example, and the second synchronization signal takes symbols 1 to 3 in the narrow-beam SSB as an example. Figure 6 The PSS and SSS in

[0203] S610: The terminal device selects an optional beam direction to search for the wide-beam PSS. When the terminal device detects the wide-beam PSS, the terminal device measures the PSS power, and the terminal device executes S620.

[0204] Exemplarily, the terminal device adjusts the direction of a receiving beam every 0.5 ms and attempts to detect the wide-beam PSS.

[0205] S620: The terminal device determines whether the detected wide-beam PSS meets the pointing requirement.

[0206] Specifically, when the power of the wide-beam PSS detected by the terminal device is greater than or equal to a certain threshold, the terminal device executes S630; when the power of the wide-beam PSS detected by the terminal device is less than the threshold, the terminal device executes S660.

[0207] Optionally, when the power of the wide-beam PSS detected by the terminal device is greater than or equal to -100 dBm, the terminal device searches for the narrow-beam SSS after the wide-beam PSS; when the power of the PSS detected by the terminal device is less than -100 dBm, the terminal device adjusts the beam pointing and continues to search for the wide-beam PSS.

[0208] Optionally, the terminal device selects to search for the SSS in the beam direction with the maximum received power among all receiving beams.

[0209] S660: Since the wide-beam PSS detected by the terminal device does not meet the pointing requirement, the terminal device adjusts the beam pointing and returns to execute S610.

[0210] S630: In a possible implementation, the terminal device receives the second synchronization signal, including: receiving the second synchronization signal according to the first synchronization signal received by the terminal.

[0211] In a possible implementation, receiving the second synchronization signal according to the first synchronization signal received by the terminal device includes: receiving the second synchronization signal according to the receiving beam direction of the first synchronization signal or the receiving beam codebook of the first synchronization signal.

[0212] In a possible implementation, the terminal device may also receive the second synchronization signal according to the time-frequency resource of the first synchronization signal or in the first synchronization signal.

[0213] Exemplarily, as Figure 6 shown, after the terminal device detects a wide-beam PSS that meets the pointing requirement, the terminal device uses the same beam as the receiving beam direction of the wide-beam PSS to search for the narrow-beam SSS.

[0214] In an embodiment of the present application, the terminal device receives a second synchronization signal according to the received first synchronization signal. The width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal, so that the number of first synchronization signals covering the terminal device within a period of time is greater than the number of second synchronization signals covering the terminal device. Therefore, compared with directly receiving the second synchronization signal, the terminal device can align with the network device faster. Furthermore, the terminal detects the second synchronization signal on the basis of aligning with the network device, reducing the time required for the terminal device during the initial access process.

[0215] In a possible implementation manner, the terminal device detects the SSS at the second symbol after detecting the wide-beam PSS.

[0216] Specifically, please refer to Figure 4 , the terminal device detects the SSS at the second symbol after detecting the wide-beam PSS that meets the pointing requirement, that is, at symbol 4 and symbol 10. Since the number of second synchronization signals that the terminal device can receive within a period of time is less than the number of first synchronization signals that the terminal device can receive during this period, the SSS may exist in the second symbol after any wide-beam PSS. For the judgment process of the terminal device, please refer to S640.

[0217] S640: The terminal device determines whether the second symbol after detecting the wide-beam PSS that meets the pointing requirement contains the SSS. If the terminal device detects the SSS, the terminal device executes S650, that is, performs initial access; if the terminal device does not detect the SSS, the terminal device executes S670.

[0218] Specifically, the SSS may exist after any wide-beam PSS. The detection of the SSS requires blind detection of the index. For example, the index of the SSS in the second signal can be 336. The terminal device needs to determine through blind detection whether the signal detected in the second symbol after the detected wide-beam PSS corresponds to one of the above 336 indexes.

[0219] S670: The terminal device keeps the receiving beam direction unchanged and attempts to detect the next wide-beam PSS. After the terminal device detects the next wide-beam PSS that meets the pointing requirement, it returns to execute S630, that is, the terminal device detects the SSS at the second symbol after detecting the next wide-beam PSS that meets the pointing requirement.

[0220] S650: The terminal device analyzes the second synchronization signal according to the detected PSS and SSS and performs initial access.

[0221] Specifically, the terminal device according to the detected PSS and SSS in and Calculate to obtain N ID , analyze the PBCH in the second synchronization signal to obtain the PBCH payload and the MIB, further analyze the SIB message, and the terminal device completes the initial access according to the MIB message and the SIB message.

[0222] In a possible implementation, during Figure 6 the initial access process shown, the terminal device performs beam scanning, searches for the wide-beam PSS in different beam directions and detects the power of the wide-beam PSS. When the detected power of the wide-beam PSS meets the access requirement, that is, when the beam direction meets the pointing requirement, the terminal device searches for the narrow-beam SSS sent by the network device after the wide-beam PSS. If the terminal device cannot search for the wide-beam PSS with a power that meets the access requirement in a beam direction, it means that the currently selected beam pointing of the terminal device does not meet the pointing requirement, and the terminal device then continues to adjust the beam pointing and continues to try to search for the wide-beam PSS in the adjusted beam direction.

[0223] Figure 7 is another schematic diagram of the broadcast signal design provided by the embodiments of the present application.

[0224] Specifically, Figure 7 taking the scenario with a subcarrier spacing of 30 kHz as an example for the schematic diagram of the broadcast signal design shown, the second synchronization signal can be located in the second signal set, and the second signal set can include 4 second synchronization signals, occupying the first time slot pair of one and a half frames. The first synchronization signal can be located in the first signal set, and the first signal set can include multiple Figure 7 time slot pairs including the first synchronization signal shown.

[0225] Specifically, in the scenario with a subcarrier spacing of 30 kHz, within one time slot pair in the first signal set, the time domain positions of the first synchronization signal are symbol 4, symbol 8 of the first time slot in this time slot pair, and symbol 2, symbol 6 of the second time slot in this time slot pair. When the second synchronization signal in the second signal set sent by the network device is adjacent to the first synchronization signal in the first signal set sent by the network device in the time domain, that is, when there is a second synchronization signal sent after the first synchronization signal, the network device sends the first synchronization signal in the first signal set at symbol 4, symbol 8 of the first time slot and symbol 2, symbol 6 of the second time slot, and sends the second synchronization signal in the second signal set, including the PBCH and the SSS, in the narrow beam directions corresponding to the wide beam direction of the first synchronization signal at symbol 5 to symbol 7, symbol 9 to symbol 11 of the first time slot and symbol 3 to symbol 5, symbol 7 to symbol 9 of the second time slot.

[0226] Furthermore, in such as Figure 7In the scenario with a subcarrier spacing of 30 kHz as shown, within one time slot in the first signal set, the time-domain positions of the first synchronization signal are symbol 4, symbol 8 in the first time slot within the time slot pair, and symbol 2, symbol 6 in the second time slot within the time slot pair. In the embodiments of the present application, since the number of first synchronization signals covering the terminal device is greater than the number of second synchronization signals covering the terminal device within a period of time, when the time slot pair containing the first synchronization signal and the time slot pair containing the second synchronization signal sent by the network device do not correspond in the same time domain, the network device only sends the first synchronization signal at symbol 4, symbol 8 in the first time slot and symbol 2, symbol 6 in the second time slot of the time slot pair, and there is no need to send the second synchronization signal at symbol 5 to symbol 7, symbol 9 to symbol 11 in the first time slot and symbol 3 to symbol 5, symbol 7 to symbol 9 in the second time slot.

[0227] It should be understood that Figure 7 The schematic diagram of the broadcast signal design shown takes the scenario with a subcarrier spacing of 30 kHz as an example. The difference between it and the scenario with a subcarrier spacing of 15 kHz is mainly reflected in the specific pattern structure. The characteristics of the signals sent by the network device when the subcarrier spacing is 30 kHz can be the same as those when the subcarrier spacing is 15 kHz. For example, the width of the transmission beam of the first synchronization signal sent by the network device is greater than the width of the transmission beam of the second synchronization signal, etc. The embodiments of the present application do not repeat the elaboration here.

[0228] It should also be understood that the characteristics of the signals detected by the terminal device when the subcarrier spacing is 30 kHz can be the same as those when the subcarrier spacing is 15 kHz. For example, the terminal device can receive the second synchronization signal according to the first synchronization signal, etc. The initial access process of the terminal device when the subcarrier spacing is 15 kHz can refer to process 600 in the above text. The embodiments of the present application do not repeat the elaboration here.

[0229] Figure 8 This is another schematic diagram of the broadcast signal design provided by the embodiments of the present application.

[0230] Specifically, Figure 8 The schematic diagram of the broadcast signal design shown takes the scenario with a subcarrier spacing of 15 kHz as an example. The second synchronization signal can be located in the second signal set. The second signal set can contain 4 second synchronization signals, occupying the first 2 time slots of 1 half-frame. The first synchronization signal can be located in the first signal set. The first signal set can include multiple Figure 4 shown time slots containing the first synchronization signal.

[0231] In a possible implementation, the network device transmits a first synchronization signal; the network device transmits a second synchronization signal, where the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal. Correspondingly, the terminal device receives the first synchronization signal; the terminal device receives the second synchronization signal, where the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal.

[0232] It should be understood that since the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal, in the embodiments of the present application, the first synchronization signal can also be referred to as a wide-beam synchronization signal, a wide-beam signal, or a wide beam, and the second synchronization signal can also be referred to as a narrow-beam synchronization signal, a narrow-beam signal, or a narrow beam. The embodiments of the present application do not limit their names.

[0233] Specifically, for the pattern design of the first synchronization signal and the second synchronization signal, please refer to Figure 8 , Figure 8 where the first synchronization signal is located at symbols 2 and 8 in a time slot, and the network device uses a wide beam to transmit at symbols 2 and 8; Figure 8 where the second synchronization signal is located at symbols 3 to 6 and symbols 9 to 12 in this time slot, and the network device uses a narrow beam to transmit at symbols 3 to 6 and symbols 9 to 12, that is, the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal.

[0234] It should be understood that the specific positions of the first synchronization signal and the second synchronization signal in the embodiments of the present application are only used as an example, and the embodiments of the present application do not limit this.

[0235] In the embodiments of the present application, the terminal device receives the first synchronization signal and the second synchronization signal transmitted by the network device, where the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal, such that the number of first synchronization signals covering the terminal device within a period of time is greater than the number of second synchronization signals covering the terminal device. Furthermore, when the terminal device adjusts the direction of the receiving beam to attempt to receive the synchronization signal of the network device, it can search for the first synchronization signal more quickly compared to directly searching for the second synchronization signal. Thus, the receiving beam of the terminal device can be aligned with the network device faster, reducing the time required for the terminal device during the initial access process.

[0236] In the embodiments of the present application, the first synchronization signal is transmitted using a beam wider than the second synchronization signal, which can increase the coverage range of the beam mapping of the first synchronization signal on the ground, thereby reducing the time when the beam sent by the network device cannot cover the location of the terminal device, and preventing the terminal device from being unable to accurately point to the network device due to the too long beamless service time and thus not receiving the downlink signal sent by the network device.

[0237] In a possible implementation manner, the first synchronization signal includes a synchronization signal generated according to the physical cell identifier PCI or a part of the content of the PCI, and the second synchronization signal includes a synchronization signal generated according to the PCI or a part of the content of the PCI.

[0238] Exemplarily, the calculation formula of the PCI is as follows:

[0239]

[0240] Wherein, It is carried in the PSS. The PSS is an m-sequence with a length of 127, and the generation formula of the sequence is:

[0241] d PSS (n) = 1 - 2x(m)

[0242]

[0243] 0 ≤ n < 127

[0244] x(i + 7) = [x(i + 4) + x(i)] mod 2

[0245] [x(6)x(5)x(4)x(3)x(2)x(1)x(0)] = [1 1 1 0 1 1 0]

[0246] It is carried in the SSS. The SSS is a gold sequence with a length of 127, and the generation formula of the sequence is:

[0247] d sSs (n) = {1 - 2X0[(n + m0) mod 127]}{1 - 2x1[(n + m1) mod 127]}

[0248]

[0249]

[0250] 0 ≤ n < 127

[0251] x0(i + 7) = [x0(i + 4) + x0(i)] mod 2

[0252] x1(i + 7) = [x1(i + 1) + x1(i)] mod 2

[0253] [x0(6) x0(5) x0(4) x0(3) x0(2) x0(1) x0(0)] = [0 0 0 0 0 0 1]

[0254] [x1(6) x1(5) x1(4) x1(3) x1(2) x1(1) x1(0)] = [0 0 0 0 0 0 1]

[0255] It should be understood that the first synchronization signal may also be other forms of signals with the same function as the PSS, and the second synchronization signal may also be other forms of signals with the same function as the SSB. The embodiments of the present application do not limit this

[0256] In a possible implementation manner, the first synchronization signal includes a first primary synchronization signal, and the second synchronization signal includes a synchronization broadcast block SSB

[0257] In a possible implementation manner, receiving the second synchronization signal includes receiving the second primary synchronization signal in the SSB according to the received first primary synchronization signal. The second primary synchronization signal corresponds one-to-one with the first primary synchronization signal, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal

[0258] Specifically, the first primary synchronization signal and the second primary synchronization signal may be the same or different. The first primary synchronization signal and the second primary synchronization signal may be different forms of sequences generated with the same information, and the second primary synchronization signal may be determined by the first primary synchronization signal

[0259] It should be understood that when the first synchronization signal is the PSS, the first synchronization signal may also be referred to as a wide-beam PSS. When the second synchronization signal is the SSB, the SSB may be referred to as a narrow-beam SSB. The present application does not limit the specific names

[0260] It should be understood that Figure 8 The structure of the SSB shown is only an example. The embodiments of the present application do not specifically limit the specific structures and time domain positions of the first synchronization signal and the second synchronization signal

[0261] It should also be understood that Figure 8 The signal content of the SSB shown is only an example. The first synchronization signal and the second synchronization signal are two synchronization signals that do not overlap in time domain for beam alignment. The embodiments of the present application do not specifically limit the content of the first synchronization signal and the second synchronization signal

[0262] In a possible implementation, within a first time duration, the number of first synchronization signals is greater than or equal to the number of second synchronization signals.

[0263] Specifically, the first synchronization signals may be located in a first signal set, and the first signal set may be continuously transmitted in a normal state; the second synchronization signals may be located in a second signal set, and the second signal set may be transmitted periodically. Since the first synchronization signals are transmitted using wide beams and the second synchronization signals are transmitted using narrow beams, within a period of time, the number of transmission beams of the first synchronization signals covering the terminal device is greater than the number of transmission beams of the second synchronization signals covering the terminal device.

[0264] In a possible implementation, the second synchronization signals are after the first synchronization signals, and the second synchronization signals are adjacent to the first synchronization signals in the time domain.

[0265] Specifically, Figure 8 One first signal set may include multiple time slots. The position of the first synchronization signals in one time slot in the first signal set is adjacent to the position of the second synchronization signals in one time slot in the associated second signal set in the time domain.

[0266] Please continue to refer to Figure 8 , in a scenario where the subcarrier spacing is 15 kHz, the network device transmits the second synchronization signals in the next symbol after transmitting the first synchronization signals, and the first synchronization signals and the second synchronization signals together occupy 5 symbols.

[0267] Specifically, in a scenario where the subcarrier spacing is 15 kHz, within one time slot of the first signal set, the time domain positions of the first synchronization signals are symbol 2 and symbol 8. When the first signal set and the second signal set transmitted by the network device correspond to the same time slot, the first synchronization signals are before the time domain positions of the second synchronization signals, that is, within this time slot, the time domain positions of the second synchronization signals are from symbol 3 to symbol 6 and from symbol 9 to symbol 12.

[0268] Specifically, in a scenario where the subcarrier spacing is 15 kHz, within one time slot of the first signal set, the time domain positions of the first synchronization signals are symbol 2 and symbol 8. Since the number of second synchronization signals transmitted by the network device within a period of time may be less than the number of first synchronization signals, when the network device transmits the first synchronization signals and the second synchronization signals do not correspond to the same time domain, the network device only transmits the first synchronization signals at symbol 2 and symbol 8, and there is no need to transmit the second synchronization signals corresponding to symbol 3 to symbol 6 and symbol 9 to symbol 12.

[0269] Furthermore, in a scenario with a subcarrier spacing of 15 kHz, in one time slot when the network device transmits the first synchronization signal and the second synchronization signal, in order to coexist with the scenario of a 30 kHz subcarrier spacing, the network device needs to reserve symbol 7 as the downlink control channel for 30 kHz subcarriers when transmitting the first synchronization signal and the second synchronization signal.

[0270] It should be understood that since the NTN scenario usually adopts the frequency division duplexing (FDD) mode, in the downlink frame structure transmitted by the network device, there is no need to reserve uplink control channel resources. Therefore, the second synchronization signal can occupy symbol 12.

[0271] In the embodiments of the present application, the second synchronization signal is adjacent to the corresponding first synchronization signal in the time domain, so that the terminal device can immediately detect the second synchronization signal after detecting the first synchronization signal, that is, the terminal device can detect the second synchronization signal in adjacent and determined time domains, reducing the system overhead of the terminal device.

[0272] In a possible implementation, the second synchronization signal has the same frequency domain center point as the first synchronization signal.

[0273] Specifically, please refer to Figure 8 , Figure 8 in which the first synchronization signal can be the first primary synchronization signal, and the frequency domain center point of the first primary synchronization signal is aligned with the frequency domain center points of the synchronization signals in each symbol of the second synchronization signal. For example, the first primary synchronization signal is aligned with the frequency domain center point of the PSS in the second synchronization signal.

[0274] In the embodiments of the present application, the terminal device can detect the second synchronization signal in a frequency band with the same frequency domain center point after detecting the first synchronization signal, thus reducing the detection overhead of the terminal device.

[0275] Figure 9 is another schematic diagram of the broadcast signal structure provided by the embodiments of the present application.

[0276] In a possible implementation, the sequence length of the first primary synchronization signal is greater than the sequence length of the second primary synchronization signal.

[0277] Specifically, since the first primary synchronization signal is transmitted using a wide beam, and the wide beam will lose beam gain, therefore, the network device can use a longer sequence to enhance the beam alignment performance.

[0278] Please refer to Figure 8 and Figure 9 , Figure 9 The broadcast signal structure shown can be used in Figure 8 the frame structure of the broadcast signal design shown. Figure 8The sequence of the first synchronization signal shown may be an m-sequence, where the length of the m-sequence is 2 N -1, Figure 8 The broadcast signal structure in Figure 9 can be replaced with the broadcast signal structure shown, that is Figure 8 The sequence of the first synchronization signal in

[0279] Exemplarily, Figure 8 and Figure 9 the sequence of PSS in

[0280] In the embodiments of the present application, since the beam width of the first primary synchronization signal is greater than the beam width of the second primary synchronization signal, and the wide beam will cause loss of beam gain, when the network device sends the first primary synchronization signal, using a sequence with a length greater than that of the second primary synchronization signal can enable the terminal device to obtain a higher detection peak when detecting the first primary synchronization signal, increase the accuracy of the terminal device to confirm receiving the first primary synchronization signal, thereby enhancing the performance of beam alignment between the terminal device and the network device and overcoming the loss of beam gain caused by the wide beam.

[0281] In a possible implementation, the network device repeatedly sends the first synchronization signal on multiple frequency bands.

[0282] In the embodiments of the present application, since the beam width of the first synchronization signal is greater than the beam width of the second synchronization signal, and the wide beam will cause loss of beam gain, the network device repeatedly sending the first synchronization signal on multiple frequency bands can enable the terminal device to receive a larger number of first synchronization signals within a period of time, increasing the chance for the terminal device to receive the first synchronization signal with the required power, thereby reducing the time required for the terminal device in the initial access process.

[0283] In a possible implementation, the network device repeatedly sends the first synchronization signal in the time domain.

[0284] In the embodiments of the present application, since the beam width of the first synchronization signal is greater than the beam width of the second synchronization signal, and the wide beam will cause loss of beam gain, the network device repeatedly sending the first synchronization signal in the time domain can have more wide-beam first synchronization signals covering the terminal device within a certain time, increasing the chance for the terminal device to receive the first synchronization signal with the required power, thereby reducing the time required for the terminal device in the initial access process.

[0285] Figure 10 is a flowchart of another terminal device initial access process 1000 provided by the embodiments of the present application.

[0286] It should be understood thatFigure 10 In the initial access process of the terminal device shown, the pattern of the synchronization signal block is Figure 9 For example, the first synchronization signal takes the wide-beam PSS as an example, the second synchronization signal takes the narrow-beam SSB as an example, and the second primary synchronization signal in the second synchronization signal takes the narrow-beam PSS as an example. Figure 10 The PSS and SSB in can also be other synchronization signals generated according to the PCI or part of the PCI content, and the present application does not specifically limit this.

[0287] S1010: The terminal device selects an optional beam direction to search for the wide-beam PSS. When the terminal device detects the wide-beam PSS, the terminal device measures the PSS power, and the terminal device executes S1020.

[0288] Exemplarily, the terminal device adjusts the direction of a receiving beam every 0.5 ms and attempts to detect the wide-beam PSS.

[0289] S1020: The terminal device determines whether the detected wide-beam PSS meets the pointing requirement.

[0290] Specifically, when the power of the wide-beam PSS detected by the terminal device is greater than or equal to a certain threshold, the terminal device executes S1030. When the power of the wide-beam PSS detected by the terminal device is less than the threshold, the terminal device executes S1070.

[0291] Optionally, when the power of the wide-beam PSS detected by the terminal device is greater than or equal to -100 dBm, the terminal device searches for the narrow-beam SSS after the wide-beam PSS. When the power of the PSS detected by the terminal device is less than -100 dBm, the terminal device adjusts the beam pointing and continues to search for the wide-beam PSS.

[0292] Optionally, the terminal device selects the beam direction with the maximum received power among all receiving beams to search for the SSS.

[0293] S1070: The wide-beam PSS detected by the terminal device does not meet the pointing requirement. The terminal device adjusts the beam pointing and returns to execute S1010.

[0294] S1030: In a possible implementation, the terminal device receives the second synchronization signal, including: receiving the second synchronization signal according to the received first synchronization signal.

[0295] In a possible implementation, receiving the second synchronization signal according to the received first synchronization signal includes: receiving the second synchronization signal according to the receiving beam direction of the first synchronization signal or the receiving beam codebook of the first synchronization signal.

[0296] In a possible implementation, the terminal device may also receive a second synchronization signal according to the time-frequency resources of the first synchronization signal or the first synchronization signal. Receive a second synchronization signal.

[0297] Exemplarily, as Figure 10 shown, after the terminal device detects a wide-beam PSS that meets the pointing requirement, the terminal device uses a beam in the same receiving beam direction as the wide-beam PSS to search for a narrow-beam PSS.

[0298] In the embodiments of the present application, the terminal device receives the second synchronization signal according to the received first synchronization signal, and the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal, so that the number of first synchronization signals covering the terminal device within a period of time is greater than the number of second synchronization signals covering the terminal device. Therefore, compared with directly receiving the second synchronization signal, the terminal device can align with the network device faster. Furthermore, based on aligning with the network device, the terminal detects the second synchronization signal, reducing the time required for the terminal device during the initial access process.

[0299] In a possible implementation, the terminal device detects the narrow-beam PSS in the first symbol after detecting the wide-beam PSS.

[0300] Specifically, please continue to refer to Figure 8 , the terminal device detects the narrow-beam PSS in the next symbol after detecting the wide-beam PSS that meets the pointing requirement, that is, symbols 3 and 9. Since the number of wide-beam PSSs that the terminal device can receive within a period of time is less than the number of narrow-beam PSSs that the terminal device can receive during this period, the narrow-beam PSS may exist in the next symbol after any wide-beam PSS. For the judgment process of the terminal device, please refer to S1040.

[0301] S1040: In a possible implementation, receiving the second synchronization signal includes: receiving the second primary synchronization signal, i.e., the narrow-beam PSS, in the SSB according to the received first primary synchronization signal, i.e., the wide-beam PSS. The second primary synchronization signal corresponds to the first primary synchronization signal one by one, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal.

[0302] In the embodiments of the present application, since the second primary synchronization signal corresponds to the first primary synchronization signal one by one, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal, that is to say, the terminal device can determine the information of the second primary synchronization signal according to the information in the received first primary synchronization signal. Furthermore, when receiving the second primary synchronization signal, the terminal device does not need to perform blind detection, saving the detection overhead of the terminal device.

[0303] Specifically, if the terminal device detects the narrow-beam PSS, the terminal device performs S1050, that is, detects the narrow-beam SSS; if the terminal device does not detect the narrow-beam PSS, the terminal device performs S1080.

[0304] S1080: The terminal device keeps the receiving beam direction unchanged and attempts to detect the next wide-beam PSS. After the terminal device detects the next wide-beam PSS that meets the pointing requirement, it returns to execute S1030, that is, the terminal device detects the narrow-beam PSS in the next symbol after detecting the next wide-beam PSS that meets the pointing requirement.

[0305] S1050: The terminal device detects the narrow-beam SSS.

[0306] In a possible implementation, the terminal device receives the secondary synchronization signal SSS in the SSB according to the received second primary synchronization signal, that is, the narrow-beam PSS.

[0307] In the embodiment of the present application, when the terminal device detects the second primary synchronization signal, it detects the second synchronization signal. Therefore, there must be a narrow-beam SSS after the second primary synchronization signal. Furthermore, the terminal device avoids the operation of repeatedly performing SSS blind detection to confirm whether a certain symbol is SSS, reducing the blind detection overhead of the narrow-beam SSS.

[0308] In a possible implementation, the terminal device detects the narrow-beam SSS in the second symbol after detecting the narrow-beam PSS.

[0309] It should be understood that in the embodiment of the present application, the time domain position where the synchronization signal is located and the position relationship between the synchronization signals in the time domain are only examples, and the present application does not specifically limit this.

[0310] Specifically, the SSS must exist after the narrow-beam PSS. For example, the SSS can be located in the second symbol after the narrow-beam PSS. Therefore, when the terminal device detects the SSS, it only needs to perform a blind detection at a determined time domain position to detect the SSS, saving the system overhead of the terminal device.

[0311] Exemplarily, the number of indexes of the SSS in the second signal can be 336. The signal detected by the terminal device in the second symbol after detecting the narrow-beam PSS must be one of the signal sequences corresponding to the 336 indexes of the SSS.

[0312] S1060: In a possible implementation, the terminal device receives the physical broadcast channel PBCH according to the second primary synchronization signal, that is, the narrow-beam PSS and the SSS, and performs initial access.

[0313] Specifically, the terminal device according to the detected PSS and SSS in and Calculate to obtain N ID , analyze the PBCH in the second synchronization signal to obtain the PBCH payload and the MIB, further analyze the SIB message, and the terminal device completes the initial access according to the MIB message and the SIB message.

[0314] In a possible implementation, during Figure 10 the initial access process shown, the terminal device performs beam scanning, searches for the wide-beam PSS in different beam directions and detects the power of the wide-beam PSS. When the detected power of the wide-beam PSS meets the access requirement, that is, when the beam direction meets the pointing requirement, the terminal device searches for the narrow-beam PSS sent by the network device after the wide-beam PSS. If the terminal device cannot search for the wide-beam PSS with a power that meets the access requirement in a beam direction, it means that the currently selected beam pointing of the terminal device does not meet the pointing requirement, and the terminal device then continues to adjust the beam pointing and continues to try to search for the PSS in the adjusted beam direction.

[0315] Figure 11 is another schematic diagram of the broadcast signal design provided by the embodiments of the present application.

[0316] Specifically, Figure 11 taking the scenario with a subcarrier spacing of 30 kHz as an example in the schematic diagram of the broadcast signal design shown, the second synchronization signal can be located in the second signal set, and the second signal set can include 4 second synchronization signals, occupying the first time slot pair of 1.5 frames. The first synchronization signal can be located in the first signal set, and the first signal set can include multiple Figure 11 time slot pairs containing the first synchronization signal shown.

[0317] Specifically, in the scenario with a subcarrier spacing of 30 kHz, within 1 time slot pair in the first signal set, the time domain positions of the first synchronization signal are symbol 4, symbol 9 in the first time slot within the time slot pair, and symbol 2, symbol 7 in the second time slot within the time slot pair. When the first synchronization signal and the second synchronization signal sent by the network device correspond in the same time domain, the time domain positions of the second synchronization signal in the first time slot within the time slot pair are symbols 5 to 8 and symbols 10 to 13, and the time domain positions of the narrow-beam SSB in the second time slot within the time slot pair are symbols 3 to 6 and symbols 8 to 11.

[0318] It should be understood that the time domain positions where the synchronization signals are located in the embodiments of the present application and the positional relationship in the time domain between the synchronization signals are only examples, and the present application does not specifically limit this.

[0319] Specifically, in a scenario with a subcarrier spacing of 30 kHz, within one time slot in the first signal set, the time domain positions of the first synchronization signal are symbol 4 and symbol 9 in the first time slot within the time slot pair, and symbol 2 and symbol 7 in the second time slot within the time slot pair. In the embodiments of the present application, since the number of first synchronization signals covering the terminal device is greater than the number of second synchronization signals covering the terminal device within a period of time, when the first signal set and the second signal set sent by the network device do not correspond to the same time domain, the network device only sends the first synchronization signal at symbol 4 and symbol 9 in the first time slot within the time slot pair, and symbol 2 and symbol 7 in the second time slot within the time slot pair, and there is no need to correspondingly send the second synchronization signal after the first synchronization signal.

[0320] Further, in a scenario with a subcarrier spacing of 30 kHz, within one time slot when the network device correspondingly sends the first synchronization signal and the second synchronization signal, in order to coexist with the scenario of 30 kHz subcarrier spacing, the network device needs to reserve symbol 7 as the downlink control channel for 30 kHz subcarriers when sending the first synchronization signal and the second synchronization signal.

[0321] It should be understood that since the NTN scenario usually adopts the frequency division duplexing (FDD) mode, in the downlink frame structure sent by the network device, there is no need to reserve uplink control channel resources. Therefore, in a scenario with a subcarrier spacing of 30 kHz, the positions of the first synchronization signal and the second synchronization signal within one time slot pair can also be located at other positions that do not affect the downlink control channel. The above-mentioned downlink control channel is the downlink control channel in the subcarrier frame structure when 30 kHz and 15 kHz coexist.

[0322] Specifically, in a scenario with a subcarrier spacing of 30 kHz, within one time slot pair when the network device correspondingly sends the first synchronization signal and the second synchronization signal, the network device reserves symbols 0 to 3 in the first time slot within the time slot pair. Among them, symbol 0 and symbol 1 serve as the downlink control channel in the 30 kHz subcarrier scenario, and symbols 0 to 3 correspond to symbol 0 and symbol 1 in the first time slot in the 15 kHz subcarrier scenario, serving as the downlink control channel in the coexisting 15 kHz subcarrier scenario. The network device reserves symbol 0 and symbol 1 in the second time slot within the time slot pair as the downlink control channel for the second time slot in the time slot pair, and the remaining symbol positions can all be used to carry the first synchronization signal and the second synchronization signal.

[0323] Exemplarily, within one time slot pair in the first signal set, the positions of the first synchronization signals can be symbol 4, symbol 9 in the first time slot within the time slot pair, and symbol 4, symbol 9 in the second time slot within the time slot pair. The second synchronization signal is after the first synchronization signal and adjacent to the position of the first synchronization signal, that is, the second synchronization signal is located at symbols 5 to 8, symbols 10 to 13 in the first time slot within the time slot pair, and symbols 5 to 8, symbols 10 to 13 in the second time slot within the time slot pair.

[0324] It should be understood that in a scenario with a subcarrier spacing of 30 kHz, the structure of the broadcast signal sent by the network device can be as Figure 9 shown, and the initial access process of the terminal device can be as Figure 10 shown. The specific steps are similar to the above content, and the embodiments of the present application will not repeat the introduction here.

[0325] Figure 12 It is a schematic structural diagram of a communication device provided by an embodiment of the present application.

[0326] The device 1200 includes a transceiver unit 1210 and a processing unit 1220. Among them, the transceiver unit 1210 can be used to implement corresponding communication functions, and the processing unit 1220 can be used to perform data processing.

[0327] Optionally, the transceiver unit 1210 can also be referred to as a communication interface or a communication unit, and includes a sending unit and / or a receiving unit. The transceiver unit 1210 can be a transceiver (including a transmitter and / or a receiver), an input / output interface (including an input and / or an output interface), a pin or a circuit, etc. The transceiver unit 1210 can be used to execute the sending and / or receiving steps in the above method embodiments.

[0328] Optionally, the processing unit 1220 can be a processor (which can include one or more), a processing circuit with processor functions, etc., and can be used to execute other steps in the above method embodiments except for sending and receiving.

[0329] Optionally, the device 1200 further includes a storage unit, and the storage unit can be a memory, an internal storage unit (such as a register, a cache, etc.), an external storage unit (such as a read-only memory, a random access memory, etc.). The storage unit is used to store instructions, and the above processing unit 1220 executes the instructions stored in the storage unit so that the communication device executes the above method.

[0330] In a design, the device 1200 can be used to perform the actions executed by the terminal device in the above method embodiments. For example, the device 1200 can be used to perform the actions executed by the terminal device in the above method 600 or 1000. At this time, the device 1200 can be a component of the terminal device. The transceiver unit 1210 is used to perform the transceiver-related operations of the terminal device in the above method embodiments, and the processing unit 1220 is used to perform the processing-related operations of the terminal device in the above method embodiments.

[0331] For example, the transceiver unit 1210 is used to receive a first synchronization signal; the transceiver unit 1210 is further used to receive a second synchronization signal. The width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal; the processing unit 1220 is used to receive the physical broadcast channel PBCH according to the second primary synchronization signal and SSS.

[0332] It should be understood that the transceiver unit 1210 and the processing unit 1220 can also perform other operations executed by the terminal device in any step of the above method 600 or 1000, which will not be elaborated here one by one.

[0333] In a design, the device 1200 can be used to perform the actions executed by the network device in the above method embodiments. For example, the transceiver unit 1210 is used to transmit a first synchronization signal; the transceiver unit 1210 is further used to transmit a second synchronization signal. The width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of multiple transmission beams of the second synchronization signal.

[0334] It should also be understood that the device 1200 is embodied in the form of functional units here. The term "unit" here can refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a dedicated processor or a group of processors, etc.) for executing one or more software or firmware programs, a memory, a combined logic circuit and / or other suitable components supporting the described functions. In an alternative example, those skilled in the art can understand that the device 1200 can specifically be the network device in the above embodiments, and can be used to execute the respective processes and / or steps corresponding to the network device in the above method embodiments. To avoid repetition, it will not be elaborated here.

[0335] The apparatus 1200 in each of the above solutions has the function of implementing the corresponding steps performed by the terminal device in the above method, or the apparatus 1200 in each of the above solutions has the function of implementing the corresponding steps performed by the network device in the above method. The function can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions; for example, the transceiver unit can be replaced by a transceiver (for example, the sending unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver), and other units, such as the processing unit, can be replaced by a processor to respectively perform the transceiver operations and related processing operations in each method embodiment.

[0336] In addition, the above transceiver unit 1210 can also be a transceiver circuit (for example, it can include a receiving circuit and a sending circuit), and the processing unit can be a processing circuit.

[0337] It should be noted that Figure 12 the apparatus in can be a network element or device in the foregoing embodiments, or a chip or a chip system, for example: a system on chip (SoC). Among them, the transceiver unit can be an input / output circuit, a communication interface; the processing unit is a processor, a microprocessor, or an integrated circuit integrated on the chip. It is not limited here.

[0338] Figure 13 is a schematic diagram of a communication architecture provided by an embodiment of the present application. Figure 13 The shown communication apparatus 1300 includes: a processor 1310, a memory 1320, and a transceiver 1330. The processor 1310 is coupled to the memory 1320 and is configured to execute instructions stored in the memory 1320 to control the transceiver 1330 to send signals and / or receive signals.

[0339] It should be understood that the above processor 1310 and memory 1320 can be integrated into a processing device, and the processor 1310 is configured to execute program code stored in the memory 1320 to implement the above functions. Specifically, in implementation, the memory 1320 can also be integrated in the processor 1310 or be independent of the processor 1310. It should be understood that the processor 1310 can also correspond to each processing unit in the previous communication apparatus, and the transceiver 1330 can correspond to each receiving unit and sending unit in the previous communication apparatus.

[0340] It should also be understood that the transceiver 1330 can include a receiver (or, a receiver) and a transmitter (or, a transmitter). The transceiver can further include an antenna, and the number of antennas can be one or more. The transceiver can also be a communication interface or an interface circuit.

[0341] Specifically, the communication device 1300 may correspond to the terminal device in method 600 or method 1000 according to the embodiments of the present application. The communication device 1300 may include units of the methods executed by the terminal device in method 600 or method 1000. It should be understood that the specific processes of each unit executing the corresponding steps above have been described in detail in the above method embodiments. For the sake of brevity, they will not be elaborated here.

[0342] When the communication device 1300 is a chip, the chip includes an interface unit and a processing unit. Among them, the interface unit may be an input / output circuit or a communication interface; the processing unit may be a processor, a microprocessor, or an integrated circuit integrated on the chip.

[0343] In the implementation process, the steps of the above method may be completed by the integrated logic circuit of the hardware in the processor or the instructions in the form of software. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed and completed by the hardware processor, or executed and completed by the combination of the hardware and software modules in the processor. The software module may be located in a mature storage medium in the art such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers, etc. This storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method. To avoid repetition, it will not be described in detail here.

[0344] It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the above method embodiments may be completed by the integrated logic circuit of the hardware in the processor or the instructions in the form of software. The above processor may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. It can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed and completed by the hardware decoding processor, or executed and completed by the combination of the hardware and software modules in the decoding processor. The software module may be located in a mature storage medium in the art such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers, etc. This storage medium is located in the memory, and the processor reads the information in the memory and combines its hardware to complete the steps of the above method.

[0345] The present application also provides a computer-readable medium, on which a computer program is stored, and when the computer program is executed by a computer, it realizes the functions of any of the above method embodiments.

[0346] The present application also provides a computer program product, which, when executed by a computer, implements the functions of any of the above method embodiments.

[0347] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center in a wired manner (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or a wireless manner (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center that includes one or more available media integrated. The available medium may be a magnetic medium (such as a floppy disk, hard disk, magnetic tape), an optical medium (such as a high-definition digital video disc (DVD)), or a semiconductor medium (such as a solid state disk (SSD)), etc.

[0348] In the embodiments of the present application, words such as "exemplary" and "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplary" in the present application should not be construed as being more preferred or having more advantages than other embodiments or designs. Rather, the use of the word "exemplary" is intended to present concepts in a specific manner.

[0349] It should be understood that the "embodiments" mentioned throughout the specification mean that specific features, structures, or characteristics related to the embodiments are included in at least one embodiment of the present application. Therefore, the embodiments mentioned throughout the specification do not necessarily refer to the same embodiments. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0350] It should be understood that in various embodiments of the present application, the magnitudes of the sequence numbers of the above processes do not imply the order of execution, and the order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application. The names of all nodes and messages in the present application are only set for the convenience of description in the present application, and their names in the actual network may be different. It should not be understood that the present application limits the names of various nodes and messages. On the contrary, any name having the same or similar function as the nodes or messages used in the present application is regarded as the method or equivalent replacement of the present application and is within the protection scope of the present application.

[0351] It should also be understood that in the present application, "when...", "if", and "in case" all refer to the fact that under certain objective circumstances, the terminal device or the base station will perform corresponding processing, which does not limit the time, and does not require the terminal device or the base station to have a judgment action when implemented, nor does it mean that there are other limitations.

[0352] In addition, the terms "system" and "network" are often used interchangeably in this article. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0353] The term "at least one of..." or "at least one kind of..." in this article means all or any combination of the items listed. For example, "at least one of A, B, and C" can represent: A exists alone, B exists alone, C exists alone, A and B exist simultaneously, B and C exist simultaneously, and A, B, and C exist simultaneously. The "at least one" in this article means one or more. The "multiple" means two or more.

[0354] It should be understood that in each embodiment of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information. The terms "comprise", "include", "have" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0355] It should be understood that in various embodiments of the present application, the first, second, and various numerical numbers are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. For example, to distinguish different information, etc.

[0356] Those of ordinary skill in the art will realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled professionals can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of this application.

[0357] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be repeated here.

[0358] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0359] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they can be located in one place, or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0360] In addition, the functional units in each embodiment of this application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit.

[0361] When the above-mentioned functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs.

[0362] As described above, the above are only specific implementation manners of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art within the technical scope disclosed by this application can easily think of changes or substitutions, which should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A communication method, characterized in that, including: receiving a first synchronization signal; receiving a second synchronization signal, wherein the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of a plurality of transmission beams of the second synchronization signal.

2. The method according to claim 1, wherein Within a first time length, the number of the first synchronization signals is greater than or equal to the number of the second synchronization signals.

3. The method according to claim 1 or 2, characterized in that, The receiving the second synchronization signal includes: receiving the second synchronization signal according to the received first synchronization signal.

4. The method according to claim 3, characterized in that The receiving the second synchronization signal according to the received first synchronization signal includes: receiving the second synchronization signal according to the receiving beam direction of the first synchronization signal or the receiving beam codebook of the first synchronization signal.

5. The method according to any one of claims 1 to 4, characterized in that The second synchronization signal has the same frequency domain center point as the first synchronization signal.

6. The method according to any one of claims 1 to 5, characterized in that, The first synchronization signal includes a synchronization signal generated according to a physical cell identifier (PCI) or a part of the PCI, and the second synchronization signal includes a synchronization signal generated according to the PCI or a part of the PCI.

7. The method according to any one of claims 1 to 6, characterized in that, The first synchronization signal includes a primary synchronization signal (PSS), and the second synchronization signal includes a secondary synchronization signal (SSS).

8. The method according to claim 7, wherein The sequence length of the PSS is greater than the sequence length of the SSS.

9. The method according to any one of claims 1 to 6, characterized in that The first synchronization signal includes a first primary synchronization signal, and the second synchronization signal includes a synchronization broadcast block (SSB).

10. The method according to claim 9, characterized in that, The receiving the second synchronization signal includes: receiving a second primary synchronization signal in the SSB according to the received first primary synchronization signal, the second primary synchronization signal corresponding to the first primary synchronization signal one by one, and the sequence of the second primary synchronization signal being determined by the sequence of the first primary synchronization signal.

11. The method according to claim 9 or 10, characterized in that, The sequence length of the first primary synchronization signal is greater than the sequence length of the second primary synchronization signal.

12. The method according to claim 10 or 11, characterized in that, The receiving the second synchronization signal further includes: receiving the SSS in the SSB according to the received second primary synchronization signal.

13. The method according to claim 12, characterized in that, further including: receiving a physical broadcast channel (PBCH) according to the second primary synchronization signal and the SSS.

14. The method according to any one of claims 1 to 13, characterized in that, The first synchronization signal is repeatedly transmitted on multiple frequency bands.

15. A communication method, characterized in that, including: transmitting a first synchronization signal; transmitting a second synchronization signal, wherein the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of a plurality of transmission beams of the second synchronization signal.

16. The method according to claim 15, characterized in that, Within a first time length, the number of the first synchronization signals is greater than or equal to the number of the second synchronization signals.

17. The method according to claim 15 or 16, characterized in that, The second synchronization signal has the same frequency domain center point as the first synchronization signal.

18. The method according to any one of claims 15 to 17, characterized in that, The first synchronization signal includes a synchronization signal generated according to a physical cell identifier (PCI) or a part of the PCI, and the second synchronization signal includes a synchronization signal generated according to the PCI or a part of the PCI.

19. The method according to any one of claims 15 to 18, characterized in that, The first synchronization signal includes a first primary synchronization signal (PSS), and the second synchronization signal includes a secondary synchronization signal (SSS).

20. The method according to claim 19, characterized in that, The sequence length of the primary synchronization signal is greater than the sequence length of the secondary synchronization signal.

21. The method according to any one of claims 15 to 18, characterized in that, The first synchronization signal includes a first primary synchronization signal PSS, the second synchronization signal includes a synchronization broadcast block SSB, the SSB includes a second primary synchronization signal, the second primary synchronization signal corresponds one-to-one with the first primary synchronization signal, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal.

22. The method according to claim 21, wherein The sequence length of the first primary synchronization signal is greater than the sequence length of the second primary synchronization signal.

23. The method according to any one of claims 15 to 22, characterized in that, Sending the first synchronization signal includes: Repeatedly sending the first synchronization signal on multiple frequency bands.

24. A communication device, characterized in that, The communication device is configured to perform the method according to any one of claims 1 to 14 or claims 15 to 23.

25. A communication device, characterized in that, The communication device includes at least one processor and at least one memory. The at least one memory is configured to store computer programs or instructions, and the at least one processor is configured to execute the computer programs or instructions in the memory, so that the method according to any one of claims 1 to 14 is executed, or so that the method according to any one of claims 15 to 23 is executed.

26. A computer-readable storage medium, characterized in that, Computer instructions are stored in the computer-readable storage medium. When the computer instructions are run on a computer, the method according to any one of claims 1 to 14 is executed, or the method according to any one of claims 15 to 23 is executed.

27. A computer program product, characterized in that, The computer program product includes computer program code. When the computer program code is run on a computer, the method according to any one of claims 1 to 14 is executed, or the method according to any one of claims 15 to 23 is executed.

Images